Chemistry e-f

6. The warming effect on the Earths surface caused by greenhouse gases absorbing energy form the earths surface.
9. A substance that scientists once thought explained why things burn
10. An upward current of warm air
13. Vertical columns
14. when a substance is heated till it turns into a liquid
17. A substance that reacts with acids, turns litmus blue and has a pH of more than 7
19. A description of how a material behaves and what it is like
20. A substance that reacts with alkalis, turns litmus red and has a pH of less than 7
23. A group pf very unreactive non-metal gases and are found in group 7 of the periodic table.
24. Horizontal rows
29. A substance that supplies oxygen for a reaction
30. An Acidic gas released from burning fossil fuels, which contributes to acid rain
31. Any substance, soluble or insoluble that neutralises an acid to form a salt and water only

1. When a substance reacts fully with oxygen
2. An element in group 7 of the periodic table
3. A reaction that gives out energy that can be felt as it heats the surrounding
4. How a substance reacts with other substances
5. An ordered list of all known elements
7. Particles made up of carbon that has not reacted with oxygen
8. Easily burns into flames
11. Fuel that formed from the dead remains of organisms over million years
12. Seprating by a block of elements
15. Something that can harm the environment / organisms that live their
16. A substance that contains tow or more elements joined together
18. A gas such as carbon dioxide, water vapour or methane in the Earths atmosphere
19. A numerical scal from 1-14 to show how acidic or alkaline a substance is
21. Is another word for burning
22. For example when hydrogen is reacted with oxygen it is called and oxide
25. Contains enough stored energy to explode if not handled correctly
26. A compound made up of only hydrogen and carbon atoms
27. Many of the products burning fuels in vehicle engines
28. Releases oxygen
31. The temperature of which a liquid boils